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  1. Autism spectrum disorder - Symptoms and causes - Mayo Clinic

  2. What is Autism? - Autism Research Institute

  3. Autism (ASD): Symptoms, Causes, Tests, Treatment & More - Healthline

  4. Autism spectrum disorder (ASD) | Autism Speaks

  5. Autism spectrum - Wikipedia

  6. What is Autism Spectrum Disorder? | CDC

  7. Autism Spectrum Disorder - National Institute of Mental Health …

  8. Autism Spectrum Disorder | National Institute of Neurological …

  9. Autism - World Health Organization (WHO)

  10. What Is Autism? - WebMD